<template>
    <div>
      <!--面包屑导航区-->
      <el-breadcrumb separator-class="el-icon-arrow-right">
        <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
        <el-breadcrumb-item>权限管理</el-breadcrumb-item>
        <el-breadcrumb-item>角色列表</el-breadcrumb-item>
      </el-breadcrumb>

      <!--卡片视图区-->
      <el-card class="box-card">
        <!-- 添加角色的按钮区  element Layout 栅格布局 搜索栏-->
        <el-row>
          <el-col>
            <el-button type="primary">添加角色</el-button>
          </el-col>
        </el-row>

        <!--角色列表区域-->
        <el-table :data="roleList" border stripe>
          <!--展开列-->
          <el-table-column type="expand">
            <template slot-scope="scope">
              <!--栅格布局-->
              <el-row :class="['bdBottom', index1 ===0 ? 'bdTop' : '', 'vcenter']" v-for="(item1, index1) in scope.row.children" :key="item1.id">
                <!--一级权限-->
                <el-col :span="5">
                  <el-tag  closable @close="removeRightById(scope.row, item1.id)" >{{ item1.authName}}</el-tag>
                  <i class="el-icon-caret-right"></i>
                </el-col>
                <!--二、三级权限-->
                <el-col :span="19">
                  <!--通过for循环渲染二级权限-->
                  <el-row :class="[index2 ===0 ? '' : 'bdTop', 'vcenter']"  v-for="(item2, index2) in item1.children" :key="item2.id">
                    <el-col :span="6">
                      <el-tag type="success" closable @close="removeRightById(scope.row, item2.id)">{{ item2.authName}}</el-tag>
                      <i class="el-icon-caret-right"></i>
                    </el-col>
                    <!--通过for循环渲染三级权限-->
                    <el-col :span="18">
                      <el-tag type="warning" v-for="(item3) in item2.children" :key="item3.id" closable @close="removeRightById(scope.row, item3.id)">{{ item3.authName}}</el-tag>
                    </el-col>
                  </el-row>
                </el-col>
              </el-row>
              <!-- <pre>{{ scope.row }}</pre> -->
            </template>
          </el-table-column>
          <!--索引列-->
          <el-table-column type="index"></el-table-column>
          <el-table-column label="角色名称" prop="roleName"></el-table-column>
          <el-table-column label="角色描述" prop="roleDesc"></el-table-column>
          <el-table-column label="角色操作" width="300px">
            <template slot-scope="scope">
              <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
              <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
              <el-button size="mini" type="warning" icon="el-icon-setting" @click="showSetRightDialog(scope.row)">分配权限</el-button>
            </template>
          </el-table-column>
        </el-table>
      </el-card>

      <!--分配权限对话框-->
      <el-dialog title="分配权限" :visible.sync="setRightDialogVisible" width="50%" @close="setRightDialogClose">

        <!--内容主体区域 树形控件-->
        <el-tree :data="rightsList" :props="treeProps"
                 show-checkbox node-key="id" :default-expand-all="true"
                 :default-checked-keys="defKeys" ref="treeRef"
        ></el-tree>

        <!--底部按钮区域-->
        <span slot="footer" class="dialog-footer">
          <el-button @click="setRightDialogVisible = false">取 消</el-button>
          <el-button type="primary" @click="allotRights">确 定</el-button>
        </span>
      </el-dialog>

    </div>
</template>

<script>
export default {
  name: 'Roles',
  data () {
    return {
      // 所有角色列表数据
      roleList: [],
      // 分配权限对话框的显示与关闭
      setRightDialogVisible: false,
      // 所有权限的数据
      rightsList: [],
      // 树形控件的属性绑定的控件
      treeProps: {
        label: 'authName',
        children: 'children'
      },
      // 树节点默认选中的三级节点id值
      defKeys: [],
      // 该权限对用的角色id
      roleId: ''
    }
  },
  methods: {
    // 获取所有角色的列表
    async getRolesList () {
      const { data: res } = await this.$http.get('roles')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.roleList = res.data
      console.log(res.data)
    },
    // 根据id删除权限
    async removeRightById (role, rightId) {
      // 弹框提醒
      const confirmResult = await this.$confirm('此操作将永久删除该权限，是否继续？', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)

      if (confirmResult !== 'confirm') {
        return this.$message.info('取消')
      }
      // console.log('确认删除')
      const { data: res } = await this.$http.delete(`roles/${role.id}/rights/${rightId}`)
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }

      // 刷新页面,这种情况会刷新整改页面，体验差
      // this.getRolesList()
      // 这种方式体验好
      role.children = res.data
    },
    // 显示权限分配对话框
    async showSetRightDialog (role) {
      // 保存角色id
      this.roleId = role.id
      // 获得数据
      const { data: res } = await this.$http.get('rights/tree')
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg)
      this.rightsList = res.data
      // console.log(this.rightsList)
      // 递归获取三级节点的id
      this.getLeafKeys(role, this.defKeys)

      // 显示
      this.setRightDialogVisible = true
    },
    // 通过递归的方式获得所有的三级权限节点（没有children节点就是三级节点），并赋值给defkeys变量
    getLeafKeys (node, arr) {
      if (!node.children) {
        return arr.push(node.id)
      }
      node.children.forEach(item => this.getLeafKeys(item, arr))
    },
    // 监听分配权限弹框的关闭事件
    setRightDialogClose () {
      // 清空树节点默认选中的三级节点id值
      this.defKeys = []
    },
    // 分配权限弹框的确定按钮
    async allotRights () {
      // Tree组件提供了两个函数，用于获得全选中和半选中的key的id, 使用...展开函数展开数据
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys()
      ]
      console.log(keys)
      const ids = keys.join(',')

      // 修改后端数据
      const { data: res } = await this.$http.post(`roles/${this.roleId}/rights`, { rids: ids })
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg)
      }
      this.$message.success('分配角色成功')
      // 重新获取角色数据
      this.getRolesList()
      // 关闭角色树形结构弹框
      this.setRightDialogVisible = false
    }
  },
  created () {
    // 页面加载时获得用户角色列表
    this.getRolesList()
  }
}
</script>

<style lang="less" scoped>
.el-tag{
  margin: 7px;
}
.bdTop{
  border-top: 1px solid #eee;
}
.bdBottom{
  border-bottom: 1px solid #eee;
}
/**纵向居中对齐**/
.vcenter{
  display: flex;
  align-items: center;
}
</style>
